It’s really up to you whether you call the person out or choose to ignore [them].

Emberger calledout the government for downplaying concerns with fracking.

Calling a person out on their bad behavior can be a difficult task.

His comments were a load of hype, and I called him on his assertion by pointing out the inconvenient facts.

While the vast majority of new words entering the language are nouns, other parts of speech can be very productive too. New phrasal verb meanings appear relatively frequently, some recent examples being big up, dial down, and dumb down.

The phrasal verb call out has a number of very well-established meanings, including to shout something (Pleasecallout your name); to ask someone to come and fix a problem (We had to call the plumber out last night); and to tell workers to stop working (They decided to call the workers out on strike). A new meaning of call out has recently entered the language, meaning to challenge someone critically for behaviour or statements that you regard as unacceptable or unjustified. The meaning is stronger than that of simply challenging someone: it suggests a degree of exasperation at the behaviour or the opinions expressed, as well as possesssion of the knowledge or authority necessary to challenge them.

The form of this verb is quite variable, as the examples above show: you can callsomeone out, onsomething, or fordoing something, or you can simply callthem onit.

Origin

Call someone out started life in American English but is now widely used in other varieties including British English. Perhaps not coincidentally, call someone out has another meaning which is mostly obsolete: in the days when duels were an accepted method of settling disputes, to call someone outmeant to challenge them to a duel.